Postemergent herbicide

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1. A herbicide that is applied to control weeds after their germination and emergence from the soil; a herbicide that kills plants after they have grown to seedling stage or beyond. See also preemergent herbicide, herbicide, nonselective herbicide, and selective herbicide.

rug2.jpg

RoundUp is one brand of postemergent herbicide.
Source: http://www.amleo.com/index/item.cgi?cmd=view&Words=rug2

ct_0605a2f1.gif

Timing of postemergent herbicide application for soybeans.
Source: http://www.omafra.gov.on.ca/english/crops/field/news/croptalk/2005/ct_0605a2.htm